Control circuit, vehicle-mounted control system and electric vehicle
By using a single control chip design in the OBC and DCDC two-in-one system, the system integration and miniaturization were achieved, solving the hardware circuit complexity and cost problems caused by multi-chip design and reducing production costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- JING JIN ELECTRIC TECH CO LTD
- Filing Date
- 2025-06-27
- Publication Date
- 2026-07-03
AI Technical Summary
In existing OBC and DC-DC integrated system designs, the use of multiple control chips leads to complex hardware circuit design, a large number of components, and a large PCB area, which increases design and production costs.
A single control chip design is adopted, with the control chip centrally located on the PCB and the power loops of the OBC and DCDC system circuits located on the periphery, realizing an integrated top-level control architecture, reducing the number of control chips and peripheral circuit components, and optimizing the hardware circuit design.
It achieves miniaturization, lightweighting, and integration of OBC and DCDC systems, reducing design and manufacturing costs and facilitating the development of more advantageous miniaturized OBC and DCDC two-in-one systems.
Smart Images
Figure CN224459658U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of control circuit technology, and in particular to a control circuit, an on-board control system, and an electric vehicle. Background Technology
[0002] The primary function of an OBC (On-Board Charger) is to convert alternating current (AC) from the power grid into direct current (DC) to charge the battery of an electric vehicle. It utilizes the vehicle's power supply to provide electrical energy to the vehicle's electronic devices or the electric vehicle's battery. OBCs come in both wired and wireless charging modes. A DC-DC converter (Direct Current-Direct Current Converter) regulates voltage in a DC power system, ensuring voltage matching between different devices. Especially in fuel cell-powered electric vehicles, where the output characteristics of the fuel cell are unstable, the voltage conversion and stabilization functions of the DC-DC converter are crucial to ensure the normal operation of the motor and maximize energy efficiency. DC-DC converters need to be designed with high conversion efficiency, excellent dynamic regulation capabilities, and a compact, lightweight design to accommodate the increasing power density of automobiles and enhance the practicality of electric vehicles.
[0003] In related technologies, most solutions for overall control of OBC and DC-DC integrated systems utilize multiple control chips, each performing a different function and coordinating with each other. Using multiple control chips implies multiple peripheral circuit designs, increasing both the number of components used in the hardware circuit design and the required component layout area on the PCB. Both of these factors increase the time and economic costs associated with PCB design, fabrication, and production.
[0004] Specifically, in the existing OBC and DCDC combined system design, in order to achieve coordinated operation of the OBC circuit and the DCDC circuit, most manufacturers' technical solutions are to use multiple control chips to control and regulate the OBC system and the DCDC system respectively.
[0005] For example, in a scheme using two control chips, chip 1 is used to control the performance of the OBC system, and chip 2 is used to control the performance of the DC-DC system. At the same time, chip 1 and chip 2 communicate with each other to ensure that the OBC system and the DC-DC system work well together.
[0006] For example, in a scheme using three control chips, chip 1 controls the performance of the OBC system, chip 2 controls the performance of the DC-DC system, and chip 3 communicates with both chip 1 and chip 2 to coordinate the cooperation between the OBC and DC-DC systems. However, this bidirectional OBC and DC-DC integrated system design uses more electronic components and requires a larger PCB area, increasing the complexity and operational difficulty of system hardware circuit design and spatial structure design. Utility Model Content
[0007] This application provides a control circuit, an on-board control system, and an electric vehicle, which integrates three functions—OBC system control, DCDC system control, and the cooperation between the two—into one, realizing an integrated top-level control architecture design. It optimizes the corresponding hardware circuit design, reduces the design and manufacturing cost of the bidirectional OBC and DCDC two-in-one system, and facilitates the realization of a more advantageous miniaturized OBC and DCDC two-in-one system.
[0008] The embodiments of this application adopt the following technical solutions:
[0009] In a first aspect, embodiments of this application provide a control circuit, wherein the control circuit includes: a control chip circuit, an OBC system circuit, and a DC-DC system circuit. The control chip circuit is centrally located on the PCB of the control circuit, and the power loops of the OBC system circuit and the DC-DC system circuit are located on the periphery of the PCB of the control circuit. The control chip circuit is connected to the power devices of the OBC system circuit and the DC-DC system circuit, respectively.
[0010] The power loop of the OBC system circuit includes: an OBC-PFC circuit, the primary side of the OBC resonant converter circuit, a resonant transformer, and the secondary side of the OBC resonant converter circuit. The OBC-PFC circuit is connected to the primary side of the OBC resonant converter circuit, and the resonant transformer isolates the primary side of the OBC resonant converter circuit from the secondary side of the OBC resonant converter circuit. The power loop of the DC-DC system circuit includes: the primary side of the DC-DC converter, a DC-DC transformer, and the secondary side of the DC-DC converter circuit. The DC-DC transformer isolates the primary side of the DC-DC converter from the secondary side of the DC-DC converter circuit.
[0011] In some embodiments, the OBC system circuit and the DC-DC system circuit serve as the bottom layer circuit of the PCB, and the control chip circuit serves as the host computer to receive feedback information from the OBC system circuit and the DC-DC system, and simultaneously send control signals to the OBC system circuit and the DC-DC system.
[0012] In some embodiments, the resonant transformer electrically connects the primary side of the OBC resonant converter circuit to the secondary side of the OBC resonant converter circuit, and isolates the primary side of the OBC resonant converter circuit from the secondary side of the OBC resonant converter circuit.
[0013] In some embodiments, the DC-DC transformer electrically connects the primary and secondary sides of the DC-DC converter and isolates the primary and secondary sides of the DC-DC converter.
[0014] In some embodiments, both the primary side and the secondary side of the OBC resonant converter circuit adopt LLC circuit or CLLC circuit.
[0015] In some embodiments, the control chip circuit, the OBC system circuit, and the DC-DC system circuit adopt a forward power flow direction, wherein the forward power flow direction is from the grid end to the vehicle end.
[0016] In some embodiments, the control chip circuit communicates bidirectionally with the OBC system circuit.
[0017] In some embodiments, the control chip circuit communicates bidirectionally with the DC-DC system circuit.
[0018] Secondly, embodiments of this application also provide a vehicle control system, wherein the vehicle control system includes the control circuit described in the first aspect.
[0019] Thirdly, embodiments of this application also provide an electric vehicle, which includes: the vehicle control system described in the second aspect.
[0020] The at least one technical solution adopted in this application embodiment can achieve the following beneficial effects: The control circuit includes a control chip circuit, an OBC system circuit, and a DC-DC system circuit. The control chip circuit is centrally arranged on the PCB of the control circuit, and the power loops of the OBC system circuit and the DC-DC system circuit are arranged on the periphery of the PCB of the control circuit. The control chip circuit is connected to the power devices of the OBC system circuit and the DC-DC system circuit, respectively. It has the characteristics of miniaturization, lightweight, and integration. The power loop of the OBC system circuit includes: an OBC-PFC circuit, the primary side of the OBC resonant converter circuit, a resonant transformer, and the secondary side of the OBC resonant converter circuit. The OBC-PFC circuit is connected to the primary side of the OBC resonant converter circuit, and the resonant transformer isolates the primary side and the secondary side of the OBC resonant converter circuit. The power loop of the DC-DC system circuit includes: the primary side of the DC-DC converter, a DC-DC transformer, and the secondary side of the DC-DC converter circuit. The DC-DC transformer isolates the primary side and the secondary side of the DC-DC converter circuit, reducing the design and manufacturing cost of the bidirectional OBC and DC-DC combined system and facilitating the realization of a more advantageous miniaturized OBC and DC-DC combined system. Attached Figure Description
[0021] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:
[0022] Figure 1 This is a schematic diagram of the internal structure of the control circuit in an embodiment of this application;
[0023] Figure 2 This is a schematic diagram of the control circuit architecture in an embodiment of this application;
[0024] Figure 3 This is a schematic diagram of the control circuit in an embodiment of this application;
[0025] Figure 4 This is a schematic diagram illustrating the interaction principle of the control circuit in the embodiments of this application. Detailed Implementation
[0026] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.
[0027] The technical solutions provided by the various embodiments of this application are described in detail below with reference to the accompanying drawings.
[0028] This application provides a control circuit, such as... Figure 1 The diagram shows the internal structure of the control circuit in this embodiment. The control circuit 100 includes a control chip circuit 1010, an OBC system circuit, and a DC-DC system circuit. The control chip 1010 is centrally located on the PCB of the control circuit. The power loop 1020 of the OBC system circuit and the power loop 1030 of the DC-DC system circuit are located on the periphery of the PCB of the control circuit. The control chip circuit 1010 is connected to the power devices of the OBC system circuit and the DC-DC system circuit, respectively. The power loop of the OBC system circuit includes 1020: OBC-PFC circuit 102. 1. The OBC resonant converter circuit includes a primary side 1022, a resonant transformer 1023, and a secondary side 1024. The OBC-PFC circuit 1021 is connected to the primary side 1024 of the OBC resonant converter circuit. The resonant transformer 1023 isolates the primary side 1022 and the secondary side 1024 of the OBC resonant converter circuit. The power loop 1030 of the DC-DC system circuit includes a DC-DC primary side 1031, a DC-DC transformer 1032, and a DC-DC secondary side 1033. The DC-DC transformer 1032 isolates the primary side 1031 and the secondary side 1033 of the DC-DC system.
[0029] The control circuit 100 in this embodiment is applicable to electric vehicles, the OBC system circuit, and the DC-DC system circuit. The OBC system circuit converts AC power from the power grid into DC power to charge the electric vehicle's battery. The DC-DC system circuit regulates the voltage in the DC power system to ensure voltage matching between different devices. Especially in fuel cell-driven electric vehicles, the voltage conversion and stabilization functions of the DC-DC system circuit are crucial due to the unstable output characteristics of the fuel cell, ensuring normal motor operation and maximizing energy efficiency.
[0030] In related technologies, a dual-chip or three-chip control architecture top-level design is employed. For example, chip 1 is used to regulate the output of the OBC system and process its feedback information, while chip 2 is used to regulate the output of the DC-DC system and process its feedback information. Simultaneously, chip 1 and chip 2 communicate with each other to ensure proper coordination between the OBC and DC-DC systems. Alternatively, chip 1 controls the performance of the OBC system and processes its feedback information, while chip 2 controls the performance of the DC-DC system and processes its feedback information. Chip 3 communicates with both chip 1 and chip 2 to coordinate the cooperation between the OBC and DC-DC systems.
[0031] Please refer to Figure 1 and Figure 3 The control chip 1010 is centrally located on the PCB of the control circuit, while the power loops 1020 and 1030 of the OBC system circuit and the DC-DC system circuit are located on the periphery of the PCB. The control chip 1010 acts as the host computer of the control circuit, while the power loops 1020 and 1030 of the OBC system circuit and the DC-DC system circuit respectively act as underlying circuit devices. The control chip 1010 is connected to the power devices of the OBC system circuit and the DC-DC system circuit. In other words, the control chip 1010 simultaneously controls the output performance and feedback information of both the OBC system circuit and the DC-DC system circuit, integrating OBC system circuit control, DC-DC system circuit control, and their mutual coordination into one integrated system. This reduces the number of control chips and peripheral circuit components used in the overall system hardware design, compresses the corresponding PCB layout, and achieves an integrated top-level control architecture design.
[0032] Please refer to Figure 1 and Figure 3 The control chip circuit 1010 is connected to the power devices of the OBC system circuit and the DC-DC system circuit respectively. The power loop of the OBC system circuit 1020 includes: OBC-PFC circuit 1021, primary side of OBC resonant converter circuit 1022, resonant transformer 1023, and secondary side of OBC resonant converter circuit 1024. The OBC-PFC circuit 1021 is connected to the primary side of OBC resonant converter circuit 1022. The resonant transformer 1023 isolates the primary side of OBC resonant converter circuit 1022 from the secondary side of OBC resonant converter circuit 1024. Specifically, the OBC-PFC circuit 1021 serves as the power factor correction circuit in the OBC system, and the resonant transformer 1023 is used to isolate the primary side of OBC resonant converter circuit 1022 from the secondary side of OBC resonant converter circuit 1024.
[0033] Please refer to Figure 1 and Figure 3 The power loop 1030 of the DC-DC system circuit includes: DC-DC primary side 1031, DC-DC transformer 1032, and DC-DC secondary side 1033. The DC-DC transformer 1032 isolates the DC-DC primary side 1031 from the DC-DC secondary side 1033.
[0034] Based on the control chip circuit 1010, the OBC system circuit, and the DCDC system circuit, pulse signal output is implemented to control the switching action of all power switching transistors in the combined OBC and DCDC system circuit. Furthermore, it includes: digital reading of analog samples such as system voltage, current, and temperature; digital fault signal reading and judgment after various faults occur; functions related to system functional safety design; and communication functions with other vehicle equipment (such as the vehicle-mounted BMS system). It is understood that the implementation of the above functions is well known to those skilled in the art and is not part of the inventive points in the embodiments of this application, and will not be described further here.
[0035] It is understood that the DC-DC primary side 1031, the DC-DC transformer 1032, and the DC-DC secondary side 1033 are electrically connected, and the specific interface is not specifically limited. Similarly, the OBC-PFC circuit 1021, the OBC resonant converter primary side 1022, the resonant transformer 1023, and the OBC resonant converter secondary side 1024 are electrically connected, and the specific interface is not specifically limited. The control chip circuit 1010 is communicatively connected to the OBC system circuit and the DC-DC system circuit; the specific communication interface is not specifically limited, but may include, but is not limited to, CAN / BUS bus, etc.
[0036] The above circuit enables coordinated operation between the OBC and DC-DC system circuits using a single control chip. The application of a single control chip in control chip circuit 1010 reduces the complexity of the peripheral circuit design, decreases the types and number of components used in the hardware circuit design, and optimizes the overall PCB layout and routing design of the hardware circuit board.
[0037] like Figure 4 As shown, the OBC circuit includes a power factor correction (PFC) circuit and a resonant converter circuit (i.e., an LLC circuit or CLLC circuit, which includes a resonant system transformer design). Figure 2As shown, the DC-DC circuit includes a phase-shifted full-bridge topology circuit for regulating the normal operating performance of the OBC circuit and the DC-DC circuit. The control system is connected to the OBC circuit and the DC-DC circuit. The OBC circuit is connected to the HVDC port, and the DC-DC circuit is connected to the LVDC port. Figure 4 As shown, this can serve as a schematic diagram of the control circuit for an electric vehicle.
[0038] HVDC (High Voltage Direct Current) ports refer to ports supplying high-voltage direct current. LVDC (Low Voltage Direct Current) ports refer to ports supplying low-voltage direct current. Compared to HVDC, LVDC has a lower voltage level and is mainly used for local power supply systems or internal power supply within equipment.
[0039] In one embodiment of this application, the OBC system circuit and the DC-DC system circuit are used as the bottom layer circuit of the PCB, and the control chip circuit 1010 is used as the host computer to receive feedback information from the OBC system circuit and the DC-DC system, and at the same time send control signals to the OBC system circuit and the DC-DC system.
[0040] like Figure 2 As shown, the control chip circuit 1010 not only acts as a host computer to receive feedback information from the OBC system circuit and the DCDC system, but also sends control signals to the OBC system circuit and the DCDC system.
[0041] In one embodiment of this application, the resonant transformer electrically connects the primary side of the OBC resonant converter circuit to the secondary side of the OBC resonant converter circuit, and isolates the primary side of the OBC resonant converter circuit from the secondary side of the OBC resonant converter circuit.
[0042] The power factor correction circuit in the OBC system is the OBC-PFC circuit. The resonant converter circuit in the OBC system includes an LLC circuit or a CLLC circuit. The resonant transformer is used to isolate the primary side and the secondary side of the OBC resonant converter circuit.
[0043] like Figure 3 The power flow shown is as follows: power enters through the OBC-PFC circuit and flows out through the secondary side of the DC-DC converter. Taking the forward power flow (from the grid end to the vehicle end) as a clockwise direction as an example, the control chip circuit is deployed in the middle, and various components in the peripheral power loop are arranged. It can be understood that the transformer of the resonant system can use the existing design, and will not be elaborated further here.
[0044] In one embodiment of this application, the DC-DC transformer electrically connects the primary and secondary sides of the DC-DC converter and isolates them. It is understood that existing designs can be used for the DC-DC transformer, and will not be elaborated further here.
[0045] In one embodiment of this application, both the primary side and the secondary side of the OBC resonant converter circuit are LLC circuits or CLLC circuits.
[0046] The OBC resonant converter circuit can use either an LLC circuit or a CLLC circuit as an option.
[0047] In one embodiment of this application, the control chip circuit, the OBC system circuit, and the DCDC system circuit adopt a forward power flow direction, wherein the forward power flow direction is from the grid end to the vehicle end.
[0048] In one embodiment of this application, the control chip circuit communicates bidirectionally with the OBC system circuit.
[0049] like Figure 2 As shown, the control chip circuit and the OBC system circuit perform bidirectional communication for OBC system data feedback and OBC system regulation.
[0050] In one embodiment of this application, the control chip circuit communicates bidirectionally with the DC-DC system circuit.
[0051] like Figure 2 As shown, the control chip circuit and the DCDC system circuit perform bidirectional communication for DCDC data feedback and DCDC system regulation.
[0052] This application embodiment also provides an in-vehicle control system, which includes a control circuit. The control circuit comprises a control chip circuit, an OBC system circuit, and a DC-DC system circuit. The control chip circuit is centrally located on the PCB of the control circuit. The power circuits of the OBC system circuit and the DC-DC system circuit are located on the periphery of the PCB of the control circuit. The control chip circuit is connected to the power devices of the OBC system circuit and the DC-DC system circuit, respectively.
[0053] The power loop of the OBC system circuit includes: an OBC-PFC circuit, the primary side of the OBC resonant converter circuit, a resonant transformer, and the secondary side of the OBC resonant converter circuit. The OBC-PFC circuit is connected to the primary side of the OBC resonant converter circuit, and the resonant transformer isolates the primary side of the OBC resonant converter circuit from the secondary side of the OBC resonant converter circuit. The power loop of the DC-DC system circuit includes: the primary side of the DC-DC converter, a DC-DC transformer, and the secondary side of the DC-DC converter circuit. The DC-DC transformer isolates the primary side of the DC-DC converter from the secondary side of the DC-DC converter circuit.
[0054] In some embodiments, the OBC system circuit and the DC-DC system circuit serve as the bottom layer circuit of the PCB, and the control chip circuit serves as the host computer to receive feedback information from the OBC system circuit and the DC-DC system, and simultaneously send control signals to the OBC system circuit and the DC-DC system.
[0055] In some embodiments, the resonant transformer electrically connects the primary side of the OBC resonant converter circuit to the secondary side of the OBC resonant converter circuit, and isolates the primary side of the OBC resonant converter circuit from the secondary side of the OBC resonant converter circuit.
[0056] In some embodiments, the DC-DC transformer electrically connects the primary and secondary sides of the DC-DC converter and isolates the primary and secondary sides of the DC-DC converter.
[0057] In some embodiments, both the primary side and the secondary side of the OBC resonant converter circuit adopt LLC circuit or CLLC circuit.
[0058] In some embodiments, the control chip circuit, the OBC system circuit, and the DC-DC system circuit adopt a forward power flow direction, wherein the forward power flow direction is from the grid end to the vehicle end.
[0059] In some embodiments, the control chip circuit communicates bidirectionally with the OBC system circuit.
[0060] In some embodiments, the control chip circuit communicates bidirectionally with the DC-DC system circuit.
[0061] The aforementioned vehicle control system features optimized hardware circuit design, reduced design and manufacturing costs of the bidirectional OBC and DC-DC integrated system, and facilitates the realization of a more advantageous miniaturized OBC and DC-DC integrated system.
[0062] This application also provides an electric vehicle, which includes: the aforementioned vehicle control system.
[0063] The above description is merely an embodiment of this application and is not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.
Claims
1. A control circuit, wherein, The control circuit includes a control chip circuit, an OBC system circuit, and a DC-DC system circuit. The control chip circuit is centrally located on the PCB of the control circuit. The power loops of the OBC system circuit and the DC-DC system circuit are located on the periphery of the PCB of the control circuit. The control chip circuit is connected to the power devices of the OBC system circuit and the DC-DC system circuit, respectively. The power loop of the OBC system circuit includes: an OBC-PFC circuit, the primary side of the OBC resonant converter circuit, a resonant transformer, and the secondary side of the OBC resonant converter circuit. The OBC-PFC circuit is connected to the primary side of the OBC resonant converter circuit, and the resonant transformer isolates the primary side of the OBC resonant converter circuit from the secondary side of the OBC resonant converter circuit. The power loop of the DC-DC system circuit includes: the primary side of the DC-DC converter, a DC-DC transformer, and the secondary side of the DC-DC converter circuit. The DC-DC transformer isolates the primary side of the DC-DC converter from the secondary side of the DC-DC converter circuit.
2. The control circuit of claim 1, wherein, The OBC system circuit and the DC-DC system circuit serve as the bottom layer circuit of the PCB, and the control chip circuit serves as the host computer to receive feedback information from the OBC system circuit and the DC-DC system, and at the same time send control signals to the OBC system circuit and the DC-DC system.
3. The control circuit of claim 2, wherein, The resonant transformer electrically connects the primary side of the OBC resonant converter circuit to the secondary side of the OBC resonant converter circuit, and isolates the primary side of the OBC resonant converter circuit from the secondary side of the OBC resonant converter circuit.
4. The control circuit of claim 1, wherein, The DC-DC transformer electrically connects the primary and secondary sides of the DC-DC converter and isolates the primary and secondary sides of the DC-DC converter.
5. The control circuit of claim 1, wherein, Both the primary and secondary sides of the OBC resonant converter circuit adopt LLC or CLLC circuits.
6. The control circuit of claim 1, wherein, The control chip circuit, the OBC system circuit, and the DC-DC system circuit adopt a forward power flow direction, wherein the forward power flow direction is from the grid end to the vehicle end.
7. The control circuit of claim 1, wherein, The control chip circuit communicates bidirectionally with the OBC system circuit.
8. The control circuit of claim 1, wherein, The control chip circuit communicates bidirectionally with the DC-DC system circuit.
9. An in-vehicle control system, wherein, The vehicle control system includes: a control circuit as described in any one of claims 1 to 8.
10. An electric vehicle, wherein, include: The vehicle control system as described in claim 9.